In English we have 26 letters. I know that in Danish there are 29.

How many letters are in YOUR alphabet?

Good question, Geoff
In Czech alphabet we have 42 letters.

A, Á, B, C, Č, D, Ď, E, É, Ě, F, G, H, CH, I, Í, J, K, L, M, N, Ň, O, Ó, P, Q, R, Ř, S, Š, T, Ť, U, Ú, Ů, V, W, X, Y, Ý, Z, Ž

I wonder if someone will post more than 42 letters.

In Finland we have
ABCDEFGHIJKLMNOPQRSTUVWXYZÅÄÖ
So 29 letters here.

Swedish have the same alphabets as we do.
Danish and Norwegian have almost the sameones. The only differences are:
Ä » Æ
Ö » Ø

lol, I`m beginning to think English has the fewest number of letters.